Rotary earth-working element



Jan. 15, 1929.

T. S. MILLER ET AL ROTARY EARTH WORKING ELEIENT F iled lay v, 1928 I l INVENTOR S Tony LS 'MILLLGI' maul (9am clue Leon Patented Jan. 15, 1929.

UNITED STATES PATENTTOFJFICE.

TONY STEPHEN MILLER AND QUAN JUE LEONG, OiE RYDE, CALIFORNIA. a

3.0mm? EARTH-WORKING ELEMENT.

Application filed May 7,

This invention relates to improvements in cutting blades for rotary earth working elements and to a method of mounting such blades and particularly represents modifil cations of the structure shown in our copending application on a rotary earth working element, Serial No. 276,232, filed May 9, 1928.

The principal object of the present invention is .to provide a novel form ofblade, and means for detachably securing the blade in place onto the rotary supporting member in such a manner that it will be easy to apply and remove the blade while at the same time .there is no tendency for the blade to become loose while in operation. a

A further object of the invention is to produce a simple and inexpensive device and yet one which will be exceedingly effective for the purpose for which it is designed.

These objects we accomplish by means of such structure and relative arrangement of parts as will fully appear by a perusal of the following specification and claims.

In the drawings similar characters of reference indicate corresponding parts in the several views:

Fig. 1 is a side elevation of one of the blade carrying units with the blades M mounted thereon.

Fig. 2 is an end elevation of the same. Fig. 3 is an enlarged plan view of a blade and its attaching means.

Fig. 4 is a cross section on the line 4-4. of Fig. 3. i

Fig. 5 is a transverse section on the line 5-5 of Fig. 3.

Referring now more particularly to the characters of reference on the drawings, 0 each blade supporting unit comprises a sheet metal disc 1 on which is fixed a hub 2 having a square hole therethrough to receive a driving shaft 3 of similar cross section. The disc is formed with a series of uniformly spaced and outwardly projecting arms 4 which at their outer ends carry transverse plates 5 arranged substantially tangential relative to the axis of rotation of the disc. The plates 5 are disposed obliquely relative B0 to the axis of the disc as plainly shown in Fi s. 2 and 3.

utting blades 6 to be applied to the plates are substantially of rhomboidal form in plan and are arranged to be attached to ll the respective plates in such a manner that the sharpened leading edges 6' of the blades 1928. Serial No. 275,713.

will be obliquely disposed to the axis of the F d sc; the opposite back edges of the blades will be parallel to and alined with the back edges of the plates; and the side edges of the blades will be parallel to the line of travel of the structure. Each blade is secured to its plate by means of transversely spaced rivets or pins 7 which are fixed in and pros ject outwardly from the plate in parallel alinement withe back edge thereof, the heads 8 of the pins being spaced from the plate a distance not less than the thickness of the blade. 1 r i Slots 9 to fit the pins extend longitudinally of and parallel to the cutting edge of the blade are cut therethrough; the, slots being of keyhole form with thelarger ends 9 of sufiicient size to receive the pin heads 8 therethrough. To press the blade firmly against said heads, a countersunk set screw 10 is mounted in the blade to project into and bear against the plate underneath. The enlarged ends of the in slots are disposed at the ends thereo o posite from the forward corner of the ob ique leading edge of the blade. Thus with the pressure of the blade against the earth, the tendency is for the blade to be shifted laterally in that direction which will cause the pins to remain at the small ends of the There is therefore practically no shearing strain on the set screw, while at the same time there is no likelihood of a blade ever shifting in the opposite direction such as would enable the heads 8 to line up and pass through the large ends of the slots, even though the set screw should become loosened.

From the foregoing description it will be readily seen that we have produced such a device as substantially fulfills the objects of the invention as set forth herein.

WVhile this specification sets. forth in detail the present and preferred construction of the device, still in practice such deviations from such detail may be resorted to as do not form a departure from the spirit of the invention, as defined by the appended claims.

Having thus described our invention, what we claim as new and useful and desire to secure by Letters Patent is: i p

1. In a plow, a rotary earth working element including transverse blade receiving plates, headed pins projecting outwardly from the plates, and blades having slots for ment including cooperation with the pins to secure the blades onto said plates, the slot-s being of key-hole TOIlll.

2. In a plow, a rotary earth working elet'ansverse blade receiving plates, headed pins projecting; outwardly from the plates, and blades having slots for cooperation with the pins to secure the blades onto said plates, the slots being of key-hole form, the cutting edge of the blade being" disposed relative to the slots and to the direction of movement of the blade so that with the engagement of said cutting edge with the ground, said blade tends to shift laterally in a direction such as will cause the pins to remain at the small ends of the slots.

3. In a plow, a rotary earth Working element including transverse blade receiving plates, headed pins projecting outwardly from the plates and blades to rest on said plates and having slots for cooperationwith the'pins to secure the blades in place on said plates; said slots being arranged at one end to receive the heads of the pins therethrough.

4c. In a plow, a rotary earth working element including transverse blade receiving plates, headed pins projecting outwardly from the plates and blades having slots for cooperation with the pins to secure the blades onto said plates; said slots at one end being arranged to receive the heads of the pins theretln'ough and the cutting edge of the blade being: disposed relative to the slots and to the direction oi movement of the blade so that with the engagement of said cutting; edge with the ground said blade tends to shift laterally in a direction such as will cause the pins to remain at the ends of the slots opposite to the pin receiving ends thereof.

In testimony whereof we aiiix our signatures.

TONY STEPHEN MILLER. QUAN J UE LEONG. 

